One was purchased at an old job for about $600 and was very small. I don't remember much about it, but it was a tiny business (maybe out of the owner's home) and didn't come with any molds.
Recent searches showed a few that were in the mid $300 range, but, as you pointed out, these aren't the large industrial ones.
The one at my old job was basically a bench top press where pellets were poured on top, melted in the tray, and, once liquified, you'd pull the handle. It would then force the liquid into the mold using the pressure.
It was a very simple unit, but clogged easy.